Yes, you are correct in adding the income reported on your W-2 form to the cost basis reported on your form 1099-B. You should report the form 1099-B amounts as listed on your 1099-B form, then you will see an option in TurboTax to adjust the cost basis your entered. The IRS will understand why you adjusted the cost basis, as the reporting on your W-2 form will indicate that your 1099-B is likely to be adjusted. You don't need to explain it anywhere.
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